DS21Q59L

The DS21Q59L from Analog Devices is a quad E1 transceiver IC that integrates all necessary functions for connecting to four E1 lines. This device is a direct replacement for the DS21Q50, offering enhanced signaling access and improved interrupt handling.

Key features include four complete E1 (CEPT) PCM-30/ISDN-PRI transceivers, pin compatibility with the DS21Q50, and support for both long-haul and short-haul line interfaces. It incorporates a 32-bit or 128-bit crystal-less jitter attenuator and frames to FAS, CAS, and CRC4 formats, with CAS/CCS signaling support.

The transceiver operates on a 3.3V low-power CMOS process and provides a flexible system clock with automatic source switching. It includes a two-frame elastic-store slip buffer on the receive side and supports interleaving PCM bus operation up to 16.384MHz. The host interface can be configured for parallel (Intel or Motorola bus operations) or serial port operation.

Designed for applications such as DSLAMs, routers, and IMA and WAN equipment, the DS21Q59L is available in a 100-pin LQFP package (14x14mm) and is surface-mounted. It offers fully independent transmit and receive functionality, four separate loopback functions, and PRBS generation/detection/error counting capabilities.